Abstract
Acoustic emissions were used to investigate the evolution of damage and strain localization in Castlegate sandstone specimens subjected to true triaxial states of stress, where the intermediate principal stress ranged from equal to minimum compression to equal to maximum compression. Three failure modes were observed: shear band formation at low mean stresses, compaction localization at intermediate stresses, and no localization at high mean stresses. For shear bands, the onset of localization consistently occurred prior to peak stress, while compaction localization initiated at the beginning of a stress plateau. The band angle (defined as the angle between the band normal and the maximum compression direction) determined by fitting a plane through the localized acoustic emission events corresponded well with the shear band angle expressed on the specimen jacket. As expected, the band angle decreased with increasing mean stress. The theoretically predicted dependence of band angle on deviatoric stress state was not confirmed; however, data scatter due to natural variations in material could obscure such a trend. Each failure mode displayed a unique acoustic emission rate response; therefore, this rate response alone can be used to determine the failure mode and the onset of localization in Castlegate sandstone.
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Acknowledgments
The authors thank Steve Bauer, David Bronowski, Scott Broome, the late Robert Hardy, John Hofer, and Wolfgang Wawersik for their stimulating conversations, advice, and assistance in conducting the experiments. We also thank Thomas Pfeifle, Thomas Dewers, and the Sandia National Laboratories Geomechanics department for their support and access to their laboratory facilities. Financial support was provided by the National Science Foundation, award EAR-0711346, to Clarkson University. Finally, we thank two anonymous reviewers and the Editor handling this submission for their insightful comments, which resulted in an improved manuscript.
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Ingraham, M.D., Issen, K.A. & Holcomb, D.J. Use of acoustic emissions to investigate localization in high-porosity sandstone subjected to true triaxial stresses. Acta Geotech. 8, 645–663 (2013). https://doi.org/10.1007/s11440-013-0275-y
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DOI: https://doi.org/10.1007/s11440-013-0275-y